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The line (y=mx+9) passes through ( (-2,3) ). What is its slope?

Answer and explanation

Correct answer: \(3\)

The point \((-2,3)\) lies on the line \(y=mx+9\). Substituting \(x=-2\) and \(y=3\) gives \(3=-2m+9\). Hence, \(-2m=-6\), so \(m=3\). If \(-3\) is used, the point gives \(y=15\), so it is incorrect. Exam tip: To find an unknown slope, substitute the coordinates of the given point into the line equation.

Related tags

Slope Of A LineY-InterceptLinear EquationsCoordinate GeometrySubstitutionSlope And Y InterceptIntroduction To PolynomialsMathematics

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